avrdude/msvc/unistd.cpp

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2020-01-18 17:05:50 +00:00
/*
* avrdude - A Downloader/Uploader for AVR device programmers
* Copyright (C) 2018 Marius Greuel
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "unistd.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <mmsystem.h>
#pragma comment(lib, "winmm.lib")
class MicroSleep
{
public:
MicroSleep()
{
if (::timeBeginPeriod(timerPeriod) == TIMERR_NOERROR)
{
m_resetTimerPeriod = true;
}
}
~MicroSleep()
{
if (m_resetTimerPeriod)
{
::timeEndPeriod(timerPeriod);
}
}
int Sleep(DWORD us)
{
if (us == 0)
{
return 0;
}
LARGE_INTEGER frequency;
if (QueryPerformanceFrequency(&frequency))
{
LARGE_INTEGER start;
QueryPerformanceCounter(&start);
if (us > 10000)
{
::Sleep((us - 5000) / 1000);
}
LARGE_INTEGER end;
end.QuadPart = start.QuadPart + (frequency.QuadPart * us / 1000000);
while (true)
{
LARGE_INTEGER current;
QueryPerformanceCounter(&current);
if (current.QuadPart >= end.QuadPart)
{
break;
}
}
}
else
{
::Sleep((us / 1000) + 1);
}
return 0;
}
private:
static const UINT timerPeriod = 1; // 1ms
bool m_resetTimerPeriod = false;
};
int usleep(unsigned int us)
{
static MicroSleep microSleep;
return microSleep.Sleep(us);
}